Go into your WP dashboard and create or edit a page or post. The large grey control panel that opens to let you type in the content has many little icons along the top of it. The last one on the top line is the magic wand. Click that, and it opens the shortcode dropdown menu. Click the shortcode that you need and WP will insert the code directly into your post. Then you just put your text content between the two square (start/end shortcode) brackets and watch what happens.